Grant schemes come and go. The Energy Savings Trust is a reliable source of the latest information.
The Small Business Loan Scheme is a Scottish Government funded scheme where eligible SMEs can borrow up to £100,000 over eight years at a fixed rate of 5%. More information is also available in the Small Business Loan brochure.
For domestic installations there are interest free loans available, further information can be found here. For biomass up to £10000 can be borrowed interest free for up to 12 years and £2000 can be claimed from the Renewable Heat Premium Payment, see here